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this is how ANC headphones work
what you ll suggest me now ?
how can i compare my designed headset with market available headphones quantitatively??
and able to say that how much much noise in attenuated in dBs with and with ANC circuit?
This is done by duplicating the listening environment of the human ear.
a) Place a microphone inside the earcup at the same spot where your ear would be,
b) seal the opening as though your head were against it.
Measure what the mic picks up in various conditions of ambient (room) noise, versus music.
You want to test low and high frequencies, at low and high volume.
Compare results with the ANC working, versus without it.
Ideally you would construct a duplicate of the ear (outer and inner parts), and place the mic 1/2 inch inside the ear canal. This will not be easy, of course.
This is done by duplicating the listening environment of the human ear.
a) Place a microphone inside the earcup at the same spot where your ear would be,
b) seal the opening as though your head were against it.
Measure what the mic picks up in various conditions of ambient (room) noise, versus music.
You want to test low and high frequencies, at low and high volume.
Compare results with the ANC working, versus without it.
Ideally you would construct a duplicate of the ear (outer and inner parts), and place the mic 1/2 inch inside the ear canal. This will not be easy, of course.
which type of microphone i should use to pick this ambient noise for my designed headset (ANC headset)??
i think it should be as sensitive as possible
what you will suggest??
Electret mics are small and inexpensive, and have a wide frequency range. (You might see this type sold for use on computer motherboards.)
An electret requires a power supply. It draws miniscule current.
It also needs amplification. A single op amp can do the job.
how can i give input signal to this micro phone ?
i mean i have used this micro phone, but i could't get require signal on oscilloscope..
If this is in simulation, I guess you'll have to simulate an audio signal (however that is done). Or as a substitute, use an AC sine wave with amplitude 10 mV.
I have only used real microphones.
no..
i am using real electret microphones..which is not picking noise or any signal..
so what i do ?
at what voltage should i operate this micro phone?
why active noise cancellation is more effective at Lower Frequencies ??
and secondly how it fulfills the claim that it provides Adaption to Noise ?
how noise power affects the performnace of active noise cancellation ??
what would be response of active noise cancellation with increase and decrease of noise power ?
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